The CAS Registry Mumber 196401-21-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,6,4,0 and 1 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 196401-21: (8*1)+(7*9)+(6*6)+(5*4)+(4*0)+(3*1)+(2*2)+(1*1)=135 135 % 10 = 5 So 196401-21-5 is a valid CAS Registry Number.
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